Oxidation is the addition of O or O2, addition of
X2 (halogens) or loss of H2. reduction is the
addition of H2 (Or H-), loss of O or
O2, loss of X2. Neither (oxidation nor
reduction) is the addition nor is loss of H+, H2O, HX etc

(a) Oxidation;
oxidation primary
alcohol is oxidized to aldehyde and aldehyde is oxidized into
acid.

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Step 2 of 11

(b) Oxidation;
oxidation;
reduction;
oxidation methane is
oxidized into methanol; which is oxidized into acid. Acid is
reduced to aldehyde which is oxidized into carbonic acid.

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Step 3 of 11

(c) Neither (
is oxidation;
is reduction)
carbon is oxidized but
carbon is reduced.

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Step 4 of 11

(d) Reduction
Alcohol is reduced to alkane

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Step 5 of 11

(e) Neither No
change in state of carbon atom.

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Step 6 of 11

(f) Oxidation

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Step 7 of 11

(g) Neither No
change oxidation sate.

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Step 8 of 11

(h) Neither No
change oxidation sate.

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Step 9 of 11

(i) Oxidation Across double bond carbon atom
group are added.

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Step 10 of 11

(j) Oxidation then
neither In first case across double bond oxygen is added. In
second case no change is oxidation state.